P073C on Mercedes-Benz
Transmission Stuck In Gear 7 / Gear 7 Engagement Fault
P073C on Mercedes-Benz vehicles indicates transmission stuck in gear 7 / gear 7 engagement fault. Au7o has documented this code across 3 Mercedes-Benz models — most commonly on A-Class, B-Class, GLB. This powertrain code relates to the transmission being unable to properly disengage or commanded gear control, generally indicating it is stuck in 7th gear (or cannot leave gear 7 as commanded). It is part of a family of newer transmission gear-engagement codes used on multi-speed automatics. The transmission computer detected that the actual gear state did not match what it commanded. This can cause harsh operation, limited gear range, or limp mode, and warrants prompt diagnosis to avoid further transmission damage. Typical repair costs on Mercedes-Benz range from $150 to $3,500, depending on the specific model and root cause.
Common Causes of P073C
- •Faulty shift solenoid or valve body fault
- •Low or contaminated transmission fluid
- •Stuck or worn valve body passages
- •Internal mechanical fault (clutch/clutch pack)
- •Wiring or connector fault in the transmission circuit
- •Faulty transmission control module
P073C on Mercedes-Benz by Model
Mercedes-Benz A-Class(1 issue)
- DCT Transmission Shudder2019-2023
The 8G-DCT dual-clutch transmission develops a shudder during low-speed acceleration, similar to driving over rumble strips. The clutch packs overheat in stop-and-go traffic, causing judder and vibration during engagement.
Mercedes-Benz B-Class(1 issue)
- Dual-Clutch Transmission (DCT) Shudder at Low Speeds2013-2019
The 7-speed dual-clutch transmission (7G-DCT) in the B-Class develops a noticeable shudder during low-speed maneuvers and from a standstill. The issue stems from clutch pack wear and adaptive software that struggles to compensate as the clutch material thins over time.
Mercedes-Benz GLB(1 issue)
- 8G-DCT Transmission Shudder2020-2025
The 8G-DCT dual-clutch transmission exhibits shudder and hesitation during low-speed maneuvers and from a standstill. While improved over the earlier 7G-DCT, the 8G-DCT still uses a wet clutch design that can judder when the clutch packs wear or the software calibration is outdated.
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View P073C across all makes →Frequently Asked Questions
What does P073C mean on Mercedes-Benz?▼
P073C stands for "Transmission Stuck In Gear 7 / Gear 7 Engagement Fault." This powertrain code relates to the transmission being unable to properly disengage or commanded gear control, generally indicating it is stuck in 7th gear (or cannot leave gear 7 as commanded). It is part of a family of newer transmission gear-engagement codes used on multi-speed automatics. The transmission computer detected that the actual gear state did not match what it commanded. This can cause harsh operation, limited gear range, or limp mode, and warrants prompt diagnosis to avoid further transmission damage. On Mercedes-Benz specifically, this code is documented across 3 models.
What causes P073C on Mercedes-Benz vehicles?▼
Common causes on Mercedes-Benz: Faulty shift solenoid or valve body fault, Low or contaminated transmission fluid, Stuck or worn valve body passages, Internal mechanical fault (clutch/clutch pack), Wiring or connector fault in the transmission circuit. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P073C on a Mercedes-Benz?▼
Repair costs on Mercedes-Benz range from $150 to $3,500, depending on the specific model and root cause.
Which Mercedes-Benz models have P073C documented?▼
Au7o has documented P073C on 3 Mercedes-Benz models: A-Class, B-Class, GLB.